From 7f3951b028ab8ed7141168f2e5ec6b1542257446 Mon Sep 17 00:00:00 2001
From: "claude[bot]" <claude[bot]@users.noreply.github.com>
Date: Wed, 4 Feb 2026 08:32:12 +0000
Subject: [PATCH] fix: skip IPv6 tests when IPv6 is unavailable
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

Add pre-flight IPv6 availability checks to prevent test failures on
systems without IPv6 support (e.g., arm64 CI runners).

Changes:
- Add is_ipv6_available() helper that checks if ::1 can be bound
- test_proxy_ipv6: Skip if IPv6 not available
- test_egress_ipv6_local: Skip if IPv6 not available
- test_ipv6_connectivity_in_vm: Skip if IPv6 not available

The tests now print "SKIP: IPv6 not available on this system" and
return Ok(()) instead of failing when IPv6 is not configured.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
---
 tests/test_proxy.rs      | 15 +++++++++++++++
 tests/test_slirp_ipv6.rs |  6 ++++++
 2 files changed, 21 insertions(+)

diff --git a/tests/test_proxy.rs b/tests/test_proxy.rs
index 0ce94562..253fa1e5 100644
--- a/tests/test_proxy.rs
+++ b/tests/test_proxy.rs
@@ -9,6 +9,11 @@ mod common;
 
 use anyhow::{Context, Result};
 
+/// Check if IPv6 is available on this system by trying to bind to ::1
+async fn is_ipv6_available() -> bool {
+    tokio::net::TcpListener::bind("[::1]:0").await.is_ok()
+}
+
 /// Get the host's global IPv6 address (if available)
 async fn get_host_ipv6() -> Option<String> {
     let output = tokio::process::Command::new("ip")
@@ -167,6 +172,11 @@ async fn test_proxy_to_addr(host_bind: &str, vm_gateway: &str, addr_type: &str)
 /// Test IPv6 proxy: VM uses fd00::2 to reach proxy on ::1
 #[tokio::test]
 async fn test_proxy_ipv6() -> Result<()> {
+    // Check if IPv6 loopback is available
+    if !is_ipv6_available().await {
+        println!("SKIP: IPv6 not available on this system");
+        return Ok(());
+    }
     test_proxy_to_addr("::1", "fd00::2", "ipv6").await
 }
 
@@ -276,6 +286,11 @@ async fn test_egress_ipv4_global() -> Result<()> {
 /// Server binds to ::1, VM connects via fd00::2 (slirp IPv6 gateway)
 #[tokio::test]
 async fn test_egress_ipv6_local() -> Result<()> {
+    // Check if IPv6 loopback is available
+    if !is_ipv6_available().await {
+        println!("SKIP: IPv6 not available on this system");
+        return Ok(());
+    }
     // slirp4netns translates fd00::2 → host's ::1
     test_egress_to_addr("::1", "fd00::2", "ipv6-local").await
 }
diff --git a/tests/test_slirp_ipv6.rs b/tests/test_slirp_ipv6.rs
index 5b02d628..514170ca 100644
--- a/tests/test_slirp_ipv6.rs
+++ b/tests/test_slirp_ipv6.rs
@@ -113,6 +113,12 @@ async fn test_dns_resolution_in_vm() -> Result<()> {
 /// This proves the NDP Neighbor Advertisement mechanism works correctly.
 #[tokio::test]
 async fn test_ipv6_connectivity_in_vm() -> Result<()> {
+    // Check if IPv6 is available on the host before starting VM
+    if tokio::net::TcpListener::bind("[::1]:0").await.is_err() {
+        println!("SKIP: IPv6 not available on this system");
+        return Ok(());
+    }
+
     let (vm_name, _, _, _) = common::unique_names("ipv6test");
 
     // Use alpine with sleep - no HTTP server needed since health uses container-ready file